Antibiotic-resistant Streptococcus pneumoniae: clinical and epidemiologic aspects

Area of Science:

• Microbiology
• Infectious Diseases
• Antimicrobial Resistance

Background:

• Increasing frequency of antibiotic-resistant Streptococcus pneumoniae, particularly penicillin-resistant strains.
• Emergence of pneumococci with intermediate penicillin resistance (IPR) and higher penicillin MICs (2-10 µg/ml).
• Reported resistance to multiple antibiotics including tetracycline, erythromycin, and beta-lactams.

Purpose of the Study:

• To review definitions and testing methods for resistant pneumococci.
• To examine the geographic distribution and epidemiologic characteristics of resistant strains.
• To discuss clinical manifestations, treatment responses, and prevention strategies for resistant pneumococcal disease.

Main Methods:

• Review of literature on Streptococcus pneumoniae resistance.
• Analysis of susceptibility testing methods and resistance definitions.
• Examination of clinical case studies and epidemiological data.

Main Results:

• Penicillin resistance in Streptococcus pneumoniae is increasing, with strains exhibiting higher MICs.
• Multiply resistant strains, including those resistant to all beta-lactams, have emerged.
• Serotype distribution and implications for pneumococcal vaccine efficacy are discussed.

Conclusions:

• Antibiotic resistance in Streptococcus pneumoniae poses a significant public health threat.
• High-dosage penicillin may be effective for IPR, but alternative agents are needed for highly resistant strains, especially in meningitis.
• Strategies to limit the spread and prevent disease caused by resistant pneumococci are crucial.